Abstract

Multiple excitongeneration and subsequent electrical extraction from a thin film photoconductive device constructed from PbSenanocrystalquantum dots are demonstrated. The hydrazine treatment of the PbSefilm drastically improves the conductivity of the film while maintaining excellent optical and structural film quality. The effects of multiple excitongeneration and electrical extraction (electrons collected per photon absorbed) were quantified as a function of incident photon energy from . The multiple carrier extraction was observed at photon energies greater than 2.8 times of the quantum dot bandgap with measured at 4.4 times the bandgap.